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        <a href="SatStress.SatStress-module.html">Module&nbsp;SatStress</a> ::
        Class&nbsp;Diurnal
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<!-- ==================== CLASS DESCRIPTION ==================== -->
<h1 class="epydoc">Class Diurnal</h1><p class="nomargin-top"><span class="codelink"><a href="SatStress.SatStress-pysrc.html#Diurnal">source&nbsp;code</a></span></p>
<pre class="base-tree">
object --+    
         |    
 <a href="SatStress.SatStress.StressDef-class.html">StressDef</a> --+
             |
            <strong class="uidshort">Diurnal</strong>
</pre>

<hr />
<p>An object defining the stress field that arises on a satellite due to 
  an eccentric orbit.</p>
  <p>Diurnal is a subclass of <a 
  href="SatStress.SatStress.StressDef-class.html" 
  class="link">StressDef</a>.  See the derivation and detailed discussion 
  of this stress field in in Wahr et al. (2008).</p>

<!-- ==================== INSTANCE METHODS ==================== -->
<a name="section-InstanceMethods"></a>
<table class="summary" border="1" cellpadding="3"
       cellspacing="0" width="100%" bgcolor="white">
<tr bgcolor="#70b0f0" class="table-header">
  <td align="left" colspan="2" class="table-header">
    <span class="table-header">Instance Methods</span></td>
</tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type"><a href="SatStress.SatStress.NSR-class.html" class="link">NSR</a></span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="SatStress.SatStress.Diurnal-class.html#__init__" class="summary-sig-name">__init__</a>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">satellite</span>)</span><br />
      Sets the object's satellite and omega attributes; calculates Love 
      numbers.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="SatStress.SatStress-pysrc.html#Diurnal.__init__">source&nbsp;code</a></span>
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">float</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="SatStress.SatStress.Diurnal-class.html#Ttt" class="summary-sig-name">Ttt</a>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">theta</span>,
        <span class="summary-sig-arg">phi</span>,
        <span class="summary-sig-arg">t</span>)</span><br />
      Calculates the &tau;_&theta;&theta; (north-south) component of the 
      stress tensor.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="SatStress.SatStress-pysrc.html#Diurnal.Ttt">source&nbsp;code</a></span>
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">float</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="SatStress.SatStress.Diurnal-class.html#Tpp" class="summary-sig-name">Tpp</a>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">theta</span>,
        <span class="summary-sig-arg">phi</span>,
        <span class="summary-sig-arg">t</span>)</span><br />
      Calculates the &tau;_&phi;&phi; (east-west) component of the stress 
      tensor.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="SatStress.SatStress-pysrc.html#Diurnal.Tpp">source&nbsp;code</a></span>
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">float</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="SatStress.SatStress.Diurnal-class.html#Tpt" class="summary-sig-name">Tpt</a>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">theta</span>,
        <span class="summary-sig-arg">phi</span>,
        <span class="summary-sig-arg">t</span>)</span><br />
      Calculates the &tau;_&phi;&theta; (off-diagonal) component of the 
      stress tensor.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="SatStress.SatStress-pysrc.html#Diurnal.Tpt">source&nbsp;code</a></span>
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
  <tr>
    <td colspan="2" class="summary">
    <p class="indent-wrapped-lines"><b>Inherited from <code>object</code></b>:
      <code>__delattr__</code>,
      <code>__getattribute__</code>,
      <code>__hash__</code>,
      <code>__new__</code>,
      <code>__reduce__</code>,
      <code>__reduce_ex__</code>,
      <code>__repr__</code>,
      <code>__setattr__</code>
      </p>
    </td>
  </tr>
<tr bgcolor="#e8f0f8" >
  <th colspan="2" class="group-header"
    >&nbsp;&nbsp;&nbsp;&nbsp;Inherited from <a href="SatStress.SatStress.StressDef-class.html">StressDef</a></th></tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">float</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="SatStress.SatStress.StressDef-class.html#Delta" class="summary-sig-name">Delta</a>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">layer_n</span>=<span class="summary-sig-default">-1</span>)</span><br />
      Calculate &Delta;, a measure of how viscous the layer's response is.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="SatStress.SatStress-pysrc.html#StressDef.Delta">source&nbsp;code</a></span>
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">complex</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="SatStress.SatStress.StressDef-class.html#Gamma" class="summary-sig-name">Gamma</a>(<span class="summary-sig-arg">self</span>)</span><br />
      Calculate the coefficient capital Gamma twiddle for the surface layer
      (see Wahr et al.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="SatStress.SatStress-pysrc.html#StressDef.Gamma">source&nbsp;code</a></span>
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">float</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="SatStress.SatStress.StressDef-class.html#Z" class="summary-sig-name">Z</a>(<span class="summary-sig-arg">self</span>)</span><br />
      Calculate the value of Z, a constant that sits in front of many terms
      in the potential defined by Wahr et al.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="SatStress.SatStress-pysrc.html#StressDef.Z">source&nbsp;code</a></span>
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="SatStress.SatStress.StressDef-class.html#__str__" class="summary-sig-name">__str__</a>(<span class="summary-sig-arg">self</span>)</span><br />
      Output information about this stress field, including frequency 
      dependent parameters.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="SatStress.SatStress-pysrc.html#StressDef.__str__">source&nbsp;code</a></span>
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">complex</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="SatStress.SatStress.StressDef-class.html#alpha" class="summary-sig-name">alpha</a>(<span class="summary-sig-arg">self</span>)</span><br />
      Calculate the coefficient alpha twiddle for the surface layer (see 
      Wahr et al.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="SatStress.SatStress-pysrc.html#StressDef.alpha">source&nbsp;code</a></span>
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">complex</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="SatStress.SatStress.StressDef-class.html#b1" class="summary-sig-name">b1</a>(<span class="summary-sig-arg">self</span>)</span><br />
      Calculate the coefficient beta one twiddle for the surface layer (see
      Wahr et al.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="SatStress.SatStress-pysrc.html#StressDef.b1">source&nbsp;code</a></span>
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">complex</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="SatStress.SatStress.StressDef-class.html#b2" class="summary-sig-name">b2</a>(<span class="summary-sig-arg">self</span>)</span><br />
      Calculate the coefficient beta two twiddle for the surface layer (see
      Wahr et al.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="SatStress.SatStress-pysrc.html#StressDef.b2">source&nbsp;code</a></span>
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="SatStress.SatStress.StressDef-class.html#calcLove" class="summary-sig-name">calcLove</a>(<span class="summary-sig-arg">self</span>)</span><br />
      Calculate the Love numbers for the satellite and the given forcing.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="SatStress.SatStress-pysrc.html#StressDef.calcLove">source&nbsp;code</a></span>
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="SatStress.SatStress.StressDef-class.html#calcLoveInfinitePeriod" class="summary-sig-name">calcLoveInfinitePeriod</a>(<span class="summary-sig-arg">self</span>)</span><br />
      Return a set of zero Love numbers constructed statically.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="SatStress.SatStress-pysrc.html#StressDef.calcLoveInfinitePeriod">source&nbsp;code</a></span>
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="SatStress.SatStress.StressDef-class.html#calcLoveWahr4LayerExternal" class="summary-sig-name">calcLoveWahr4LayerExternal</a>(<span class="summary-sig-arg">self</span>)</span><br />
      Use John Wahr's Love number code to calculate h, k, and l.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="SatStress.SatStress-pysrc.html#StressDef.calcLoveWahr4LayerExternal">source&nbsp;code</a></span>
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a name="forcing_period"></a><span class="summary-sig-name">forcing_period</span>(<span class="summary-sig-arg">self</span>)</span><br />
      Calculate the forcing period based on the forcing frequency (omega).</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="SatStress.SatStress-pysrc.html#StressDef.forcing_period">source&nbsp;code</a></span>
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">complex</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="SatStress.SatStress.StressDef-class.html#g1" class="summary-sig-name">g1</a>(<span class="summary-sig-arg">self</span>)</span><br />
      Calculate the coefficient gamma one twiddle for the surface layer 
      (see Wahr et al.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="SatStress.SatStress-pysrc.html#StressDef.g1">source&nbsp;code</a></span>
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">complex</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="SatStress.SatStress.StressDef-class.html#g2" class="summary-sig-name">g2</a>(<span class="summary-sig-arg">self</span>)</span><br />
      Calculate the coefficient gamma two twiddle for the surface layer 
      (see Wahr et al.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="SatStress.SatStress-pysrc.html#StressDef.g2">source&nbsp;code</a></span>
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">complex</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="SatStress.SatStress.StressDef-class.html#lambda_twiddle" class="summary-sig-name">lambda_twiddle</a>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">layer_n</span>=<span class="summary-sig-default">-1</span>)</span><br />
      Calculate the frequency-dependent Lame parameter &lambda; for a 
      Maxwell rheology.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="SatStress.SatStress-pysrc.html#StressDef.lambda_twiddle">source&nbsp;code</a></span>
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">complex</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="SatStress.SatStress.StressDef-class.html#mu_twiddle" class="summary-sig-name">mu_twiddle</a>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">layer_n</span>=<span class="summary-sig-default">-1</span>)</span><br />
      Calculate the frequency-dependent Lame parameter &mu; for a Maxwell 
      rheology.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="SatStress.SatStress-pysrc.html#StressDef.mu_twiddle">source&nbsp;code</a></span>
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
</table>
<!-- ==================== CLASS VARIABLES ==================== -->
<a name="section-ClassVariables"></a>
<table class="summary" border="1" cellpadding="3"
       cellspacing="0" width="100%" bgcolor="white">
<tr bgcolor="#70b0f0" class="table-header">
  <td align="left" colspan="2" class="table-header">
    <span class="table-header">Class Variables</span></td>
</tr>
<tr bgcolor="#e8f0f8" >
  <th colspan="2" class="group-header"
    >&nbsp;&nbsp;&nbsp;&nbsp;Inherited from <a href="SatStress.SatStress.StressDef-class.html">StressDef</a></th></tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type"><a href="SatStress.SatStress.LoveNum-class.html" 
      class="link">LoveNum</a></span>
    </td><td class="summary">
        <a name="love"></a><span class="summary-name">love</span> = <code title="LoveNum(0, 0, 0, 0, 0, 0)">LoveNum(0, 0, 0, 0, 0, 0)</code><br />
      the Love numbers which result from the given forcing frequency and 
      the specified satellite structure.
    </td>
  </tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">float</span>
    </td><td class="summary">
        <a name="omega"></a><span class="summary-name">omega</span> = <code title="0.0">0.0</code><br />
      the forcing frequency associated with the stress.
    </td>
  </tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type"><a href="SatStress.SatStress.Satellite-class.html" 
      class="link">Satellite</a></span>
    </td><td class="summary">
        <a name="satellite"></a><span class="summary-name">satellite</span> = <code title="None">None</code><br />
      the satellite which the stress is being applied to.
    </td>
  </tr>
</table>
<!-- ==================== PROPERTIES ==================== -->
<a name="section-Properties"></a>
<table class="summary" border="1" cellpadding="3"
       cellspacing="0" width="100%" bgcolor="white">
<tr bgcolor="#70b0f0" class="table-header">
  <td align="left" colspan="2" class="table-header">
    <span class="table-header">Properties</span></td>
</tr>
  <tr>
    <td colspan="2" class="summary">
    <p class="indent-wrapped-lines"><b>Inherited from <code>object</code></b>:
      <code>__class__</code>
      </p>
    </td>
  </tr>
</table>
<!-- ==================== METHOD DETAILS ==================== -->
<a name="section-MethodDetails"></a>
<table class="details" border="1" cellpadding="3"
       cellspacing="0" width="100%" bgcolor="white">
<tr bgcolor="#70b0f0" class="table-header">
  <td align="left" colspan="2" class="table-header">
    <span class="table-header">Method Details</span></td>
</tr>
</table>
<a name="__init__"></a>
<div>
<table class="details" border="1" cellpadding="3"
       cellspacing="0" width="100%" bgcolor="white">
<tr><td>
  <table width="100%" cellpadding="0" cellspacing="0" border="0">
  <tr valign="top"><td>
  <h3 class="epydoc"><span class="sig"><span class="sig-name">__init__</span>(<span class="sig-arg">self</span>,
        <span class="sig-arg">satellite</span>)</span>
    <br /><em class="fname">(Constructor)</em>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="SatStress.SatStress-pysrc.html#Diurnal.__init__">source&nbsp;code</a></span>&nbsp;
    </td>
  </tr></table>
  
  <p>Sets the object's satellite and omega attributes; calculates Love 
  numbers.</p>
  <dl class="fields">
    <dt>Parameters:</dt>
    <dd><ul class="nomargin-top">
        <li><strong class="pname"><code>satellite</code></strong> (<a href="SatStress.SatStress.Satellite-class.html" 
          class="link">Satellite</a>) - the satellite to which the stress is being applied.</li>
    </ul></dd>
    <dt>Returns: <a href="SatStress.SatStress.NSR-class.html" class="link">NSR</a></dt>
        <dd>an object defining the NSR stresses for a particular satellite.</dd>
    <dt>Overrides:
        object.__init__
    </dt>
  </dl>
</td></tr></table>
</div>
<a name="Ttt"></a>
<div>
<table class="details" border="1" cellpadding="3"
       cellspacing="0" width="100%" bgcolor="white">
<tr><td>
  <table width="100%" cellpadding="0" cellspacing="0" border="0">
  <tr valign="top"><td>
  <h3 class="epydoc"><span class="sig"><span class="sig-name">Ttt</span>(<span class="sig-arg">self</span>,
        <span class="sig-arg">theta</span>,
        <span class="sig-arg">phi</span>,
        <span class="sig-arg">t</span>)</span>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="SatStress.SatStress-pysrc.html#Diurnal.Ttt">source&nbsp;code</a></span>&nbsp;
    </td>
  </tr></table>
  
  <p>Calculates the &tau;_&theta;&theta; (north-south) component of the 
  stress tensor.</p>
  <dl class="fields">
    <dt>Parameters:</dt>
    <dd><ul class="nomargin-top">
        <li><strong class="pname"><code>theta</code></strong> - the co-latitude of the point at which to calculate the stress 
          [rad].</li>
        <li><strong class="pname"><code>phi</code></strong> - the east-positive longitude of the point at which to calculate 
          the stress [rad].</li>
        <li><strong class="pname"><code>t</code></strong> - the time, in seconds elapsed since pericenter, at which to 
          perform the stress calculation [s].</li>
    </ul></dd>
    <dt>Returns: float</dt>
        <dd>the &tau;_&theta;&theta; component of the 2x2 membrane stress 
          tensor.</dd>
    <dt>Overrides:
        <a href="SatStress.SatStress.StressDef-class.html#Ttt">StressDef.Ttt</a>
    </dt>
  </dl>
</td></tr></table>
</div>
<a name="Tpp"></a>
<div>
<table class="details" border="1" cellpadding="3"
       cellspacing="0" width="100%" bgcolor="white">
<tr><td>
  <table width="100%" cellpadding="0" cellspacing="0" border="0">
  <tr valign="top"><td>
  <h3 class="epydoc"><span class="sig"><span class="sig-name">Tpp</span>(<span class="sig-arg">self</span>,
        <span class="sig-arg">theta</span>,
        <span class="sig-arg">phi</span>,
        <span class="sig-arg">t</span>)</span>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="SatStress.SatStress-pysrc.html#Diurnal.Tpp">source&nbsp;code</a></span>&nbsp;
    </td>
  </tr></table>
  
  <p>Calculates the &tau;_&phi;&phi; (east-west) component of the stress 
  tensor.</p>
  <dl class="fields">
    <dt>Parameters:</dt>
    <dd><ul class="nomargin-top">
        <li><strong class="pname"><code>theta</code></strong> - the co-latitude of the point at which to calculate the stress 
          [rad].</li>
        <li><strong class="pname"><code>phi</code></strong> - the east-positive longitude of the point at which to calculate 
          the stress [rad].</li>
        <li><strong class="pname"><code>t</code></strong> - the time, in seconds elapsed since pericenter, at which to 
          perform the stress calculation [s].</li>
    </ul></dd>
    <dt>Returns: float</dt>
        <dd>the &tau;_&phi;&phi; component of the 2x2 membrane stress tensor.</dd>
    <dt>Overrides:
        <a href="SatStress.SatStress.StressDef-class.html#Tpp">StressDef.Tpp</a>
    </dt>
  </dl>
</td></tr></table>
</div>
<a name="Tpt"></a>
<div>
<table class="details" border="1" cellpadding="3"
       cellspacing="0" width="100%" bgcolor="white">
<tr><td>
  <table width="100%" cellpadding="0" cellspacing="0" border="0">
  <tr valign="top"><td>
  <h3 class="epydoc"><span class="sig"><span class="sig-name">Tpt</span>(<span class="sig-arg">self</span>,
        <span class="sig-arg">theta</span>,
        <span class="sig-arg">phi</span>,
        <span class="sig-arg">t</span>)</span>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="SatStress.SatStress-pysrc.html#Diurnal.Tpt">source&nbsp;code</a></span>&nbsp;
    </td>
  </tr></table>
  
  <p>Calculates the &tau;_&phi;&theta; (off-diagonal) component of the 
  stress tensor.</p>
  <dl class="fields">
    <dt>Parameters:</dt>
    <dd><ul class="nomargin-top">
        <li><strong class="pname"><code>theta</code></strong> - the co-latitude of the point at which to calculate the stress 
          [rad].</li>
        <li><strong class="pname"><code>phi</code></strong> - the east-positive longitude of the point at which to calculate 
          the stress [rad].</li>
        <li><strong class="pname"><code>t</code></strong> - the time in seconds elapsed since pericenter, at which to perform
          the stress calculation [s].</li>
    </ul></dd>
    <dt>Returns: float</dt>
        <dd>the &tau;_&phi;&theta; component of the 2x2 membrane stress 
          tensor.</dd>
    <dt>Overrides:
        <a href="SatStress.SatStress.StressDef-class.html#Tpt">StressDef.Tpt</a>
    </dt>
  </dl>
</td></tr></table>
</div>
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